An interventional study of opaqued titanium abutments and lithium disilicate coping (high opacity) in Aesthetic Outcome of Crowns on Implants, sponsored by Cairo University. Completed at 1 site in Egypt. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-06-13.
Sponsored by Cairo University · Not applicable, Interventional, and Other
Implants have become the perfect solution for replacement of missing single teeth, partial or even complete edentulism.18 However, the dilemma of anterior implant-supported prosthesis is still not quite solved.19-21 Implant abutments are one of the esthetic influencers. And concerning the material, ready-made titanium abutments are considered the gold standard of all. Nevertheless, the esthetic properties remain doubtful. Lithium disilicate ceramics have been used as implant superstructures for many years now for their combined esthetic and biomechanical properties. The purpose of the present study is to evaluate the effect of using titanium implant abutment on the color of lithium disilicate crowns and the significance of masking the titanium abutments with opaque porcelain or using opaque lithium disilicate coping on the final esthetic outcome
Clinical resemblance is one the of main factors that preclude the success of any restoration. The use of conventional titanium implant abutment and ceramic restoration succeeded to prevail until now. New ceramic and polymer derivatives have been introduced such as hybrid ceramics, PEEK and PEKK. However, the low mechanical properties and the ease of breakage still limited them to certain clinical situations. Hybrid fixture-abutment combinations such as hybrid abutments and hybrid crowns proved to be highly efficient in the literature. But the technique sensitivity and the urge of high clinical and laboratory skills are obstacles that must be taken into consideration. This is the reason that finding esthetic modification of the conventional techniques seems reasonable. Masking the color of the underlying abutment appears to be a simple and easily achievable solution for having a highly esthetic implant supported prosthesis.
The importance of peri-implant soft tissues, whether esthetically or biologically, has been emphasized in literature. (4) Furthermore, achieving the desired esthetic outcome depends on simultaneously matching the proper esthetic criteria of the tooth and its supporting structures. (5) Esthetic failures in implant dentistry can be categorized as pink-tissue failures and white-tissue failures. (6) Pink esthetics include color, texture and level of peri-implant tissues (7), while white esthetics include color, shape and characterization of crown. (3) The mode of fabrication also influences the performance of the materials, where the use of press technology facilitates the construction of implant supported crowns, offering precision of fit, durability and esthetic materials application. (11)
Cairo University is the lead sponsor of 4,780 studies on the registry; 1,427 are open to participants now.
Of its 36 completed or terminated interventional studies of FDA-regulated products, 5 (14%) have results posted.
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Exclusion Criteria:
Lithium disilicate crowns over titanium abutments covered by a layer of opaque porcelain
Other: opaqued titanium abutments
Lithium disilicate crowns over titanium abutments covered by lithium disilicate (high opacity) coping
Other: lithium disilicate coping (high opacity)
Lithium disilicate crowns over uncovered titanium abutments directly without masking
Other: titanium abutment with no color masking
masking metallic color of titanium abutments by opaque porcelain
masking metallic color of titanium abutments using lithium disilicate copings
Also known as: E-max coping
color masking methods are avoided in this arm
Pink esthetics and White esthetics
using numerical score (0-10) to evaluate the aesthetics of soft and hard dental tissues
Time frame: six months
Color measurements
using Spectrophotometer to evaluate color in terms of CIE L\* a\* b\* values
Time frame: six months
Plan to share: Undecided
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This study is completed, as verified in Jun 2025. You cannot join it, but the record below documents what was studied.
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Cairo University